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Clay Minerals Clay Minerals

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Structure et proprietes d'hydratation des nontronites

Published online by Cambridge University Press:  09 July 2018

H. Suquet ,
C. Malard  and
H. Pezerat
H. Suquet
Affiliation:
Laboratoire de Réactivité de Surface et Structure UA 1106, CNRS, Univ. P. et M. Curie, 4 Place Jussieu, 75252 Paris Cédex 05, France
C. Malard
Affiliation:
Laboratoire de Réactivité de Surface et Structure UA 1106, CNRS, Univ. P. et M. Curie, 4 Place Jussieu, 75252 Paris Cédex 05, France
H. Pezerat
Affiliation:
Laboratoire de Réactivité de Surface et Structure UA 1106, CNRS, Univ. P. et M. Curie, 4 Place Jussieu, 75252 Paris Cédex 05, France
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Résumé

Les nontronites ne présentent pas les propriétés caractéristiques des phyllosilicates 2:1 magnésiens ou alumineux à substitutions tétraédriques: domaines d'hydratation homogène, isotherme de désorption d'eau avec paliers, organisation structurale ordonnée ou semi-ordonnée. Or les analyses structurales montrent que ce sont des beidellites ferriffères et l'étude de l'effet Hofmann–Klemen confirme le taux très faible de lacunes et de substitutions octaédriques. Diverses hypothèses justifiant ces propriétés sont présentées et discutées.

Abstract

Abstract

Nontronites do not present the typical properties of 2:1 Mg- or Al-phyllosilicates with tetrahedral substitutions, namely homogeneous hydration domains, water desorption isotherms with plateaux, and ordered or semi-ordered structures. Structural chemical analysis shows that they are ferric beidellites and study of the Hofmann-Klemen effect confirms the limited extent of substitutions and vacancies in the octahedral sheet. Several hypotheses which could explain these properties are discussed.

Type
Research Article
Information
Clay Minerals , Volume 22 , Issue 2 , June 1987 , pp. 157 - 167
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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References

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